10/17/17 85% This is a Numeric Entry question/It is worth 1 point/You have unlim

Question

10/17/17 85% This is a Numeric Entry question/It is worth 1 point/You have unlimited attempts/There is no attempt penalty uestion (1 point) a See page 293 ne aquatic ecosystems, nitrate (NOs) is converted to nitrite (NO2 ). which then decomposes to nitrogen and water. As an example of this second ion, consider the decomposition of ammonium nitrite: A02(aq) N2(g) + 2H20(1) 9th attempt ll See Perlodic Table See Hint What would be the change in pressure in a sealed 100 L vessel due to the formation of N2 gas when the ammonium nitrite in 1.60L of 140 MNH NO2 decomposes at 25.0 C?

Explanation / Answer

We have reaction as:

NH4NO2 ----->N2 + 2H2O

moles of NH4NO2 = molarity x volume in litres = 1.4 M x 1.6L = 2.24 mol

1 mol NH4NO2 gives 1 mol N2

2.24 mol will give 2.24 mol N2

total vessel volume = 10L

volume of gas = 10L - 1.6L(volume of liquid) = 8.4L

Temperature(T) = 25 oC = 25 + 273 = 298 K

assume nitrogen formed is ideal gas

P = nRT/V = 2.24 mol x 0.08206 L.atm/mol.K x 298K / 8.4 L = 6.52 atm

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